CN103360094A - Fireproof oxygen blowing tube coating - Google Patents

Fireproof oxygen blowing tube coating Download PDF

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Publication number
CN103360094A
CN103360094A CN2013103225318A CN201310322531A CN103360094A CN 103360094 A CN103360094 A CN 103360094A CN 2013103225318 A CN2013103225318 A CN 2013103225318A CN 201310322531 A CN201310322531 A CN 201310322531A CN 103360094 A CN103360094 A CN 103360094A
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CN
China
Prior art keywords
coating
oxygen lance
fireproof
fireproof oxygen
blowing tube
Prior art date
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CN2013103225318A
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Chinese (zh)
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CN103360094B (en
Inventor
巩秀民
高山
刘杰
刘少斌
郭鹏
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LAIWU STEEL AND IRON GROUP XINXING LIQUID GAS Co.,Ltd.
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LAIGANG GROUP TAIDONG INDUSTRIES Co Ltd
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Priority to CN201310322531.8A priority Critical patent/CN103360094B/en
Publication of CN103360094A publication Critical patent/CN103360094A/en
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Publication of CN103360094B publication Critical patent/CN103360094B/en
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Abstract

The invention relates to the field of refractory materials for the steel metallurgy, and concretely relates to a fireproof oxygen blowing tube coating. The raw materials of the fireproof oxygen blowing tube coating comprise 20-50wt% of mullite, 8-15wt% of silicon carbide, 10-20wt% of andalusite, 5-10wt% of rho-alumina micropowder, 2-6wt% of aluminate cement, 5-10wt% of water glass and 2.1-6.5wt% of an additive. The coating has the characteristics of one-time forming through smearing, no need of baking, and obvious cost advantage. The coating can effectively solve the problems of cracks and expansion at a high temperature, and substantially improves the use quality; no damage of an oxygen blowing tube is powerfully guaranteed in the transportation and use processes by adopting a high-strength wear resistant material; and the coating has the advantages of extremely strong plasticity and adhesiveness, direct construction without any treatment of the oxygen blowing tube, simplicity and convenience.

Description

A kind of fireproof oxygen lance coating
Technical field
The present invention relates to the ferrous metallurgy fire resisting material field, particularly, the present invention relates to a kind of fireproof oxygen lance coating.
Background technology
Oxygen lance is widely used in that steelmaking oxygen blowing prepurging, steel teeming ladle oxygen blast are opened and watered, the fields such as iron notch are opened in the iron-smelting blast furnace oxygen blast, for prolonging the life-span of oxygen lance, international and domestic common practice is that the appearance of common oxygen blow steel pipe is coated refractory substance, reaches the purpose that reduces labour intensity and reduce loss per ton steel.But most silicate or the magnesium oxide class materials of adopting of this coating can play a role with the oxygen lance after these material coatings, but the problem of ubiquity three aspects:: all need low-temperature bake after the first moulding, both cost was high, prolonged again fabrication cycle; It two is that thermal expansivity and the metal of coating under the high temperature do not mate, and intensity and wear resistance are inadequate, cause work-ing life short; It three is that oxygen lance all needs the processing such as rust cleaning before coating, wastes time and energy.
Summary of the invention
The object of the invention is to: a kind of refractory materials prescription be used to smearing oxygen lance is provided, once shaped, need not baking, and prescription by adjust the coefficient of expansion can be effectively and the metal material coefficient of expansion match, reach not explosion in the use procedure, falling-off effect not, high strength and wear resistance solve in-problem purpose in production, the use procedure to reach.
Fireproof oxygen lance coating of the present invention, raw materials by weight comprises:
Mullite 20%-50%, silicon carbide 8%-15%, andaluzite 10%-20%, ρ-alumina powder 5%-10%, aluminate cement 2%-6%, water glass 5%-10%, additive 2.1%-6.5%.
According to fireproof oxygen lance coating of the present invention, described additive comprises the combination of the detonation suppressor of the softening agent of 2%-6% and 0.1%-0.5%.
Preferably, above-mentioned softening agent is Walocel MT 20.000PV or clay, and above-mentioned detonation suppressor is explosion-proof fiber or metallic aluminium.
According to fireproof oxygen lance coating of the present invention, wherein, according to the construction temperature difference in (four seasons), adjust initial set, final setting time, generally speaking, the presetting period is about 1 hour, and final setting time is about 5 hours and is optimum regime.For example: north of china in winter temperature low (subzero below 10 ℃), the setting rate of cement, water glass is relatively slow, if coating can not reach some strength for a long time, will cause be full of cracks, so in the winter time in the situation of construction, a kind of method needs baking, and another kind of method also can be added Sodium Silicofluoride as the setting accelerator of water glass, accelerates the setting rate of coating.According to the difference of temperature, the Sodium Silicofluoride add-on is the 10%-30% of water glass consumption, and according to fireproof oxygen lance formulation for coating material of the present invention, the Sodium Silicofluoride addition is 0.5%-3% by weight percentage.
The method of fireproof oxygen lance coating in the preparation of the present invention may further comprise the steps:
1) mullite, silicon carbide, andaluzite, alumina powder and aluminate cement are put into stirrer and be dry mixed the glass of falling back, additive and water;
2) with step 1) gained mixture through stirring, obtain fireproof oxygen lance coating.
Particularly, further preferably prepare the method for upper fireproof oxygen lance coating, may further comprise the steps:
1) mullite, silicon carbide, andaluzite, alumina powder and aluminate cement put into stirrer be dry mixed 5 minutes after, pour the water of water glass, additive and 4%-7% into;
2) with step 1) gained mixture after stirring 7-10 minute, become sticky shape namely to make fireproof oxygen lance coating.
The above-mentioned fireproof oxygen lance coating that makes (but the engineering time is about 60 minutes) is smeared on the oxygen lance surface evenly (thickness is 3-5mm approximately), and at room temperature maintenance got final product bundling, packing or use in 3 days after the moulding.
Fireproof oxygen lance coating of the present invention, refractoriness is greater than 1750 ℃, cohesive strength is greater than 0.65MPa, thermal conductivity is about 0.96W/mK, thermal shock resistance is greater than 60 times, folding strength (110 ℃ * 24h): 7.8MPa, ultimate compression strength (110 ℃ * 24h): 47MPa, its performance index all are better than product of the same type.
The present invention compares with the existing oxygen lance coating in this area and has the following advantages:
1, the present invention smears once shaped, and maintenance is directly on-the-spot use after 3 days, need not baking, and cost advantage is obvious.
2, coefficient of expansion mismatch problem in formulating of recipe is paid attention between metal and the refractory materials, the present invention effectively solves the problem that crackle produces, expands under the high temperature, greatly improves functional quality.
3, because general oxygen lance is long, pull in transportation, on-the-spot use procedure, cause the damaged certain proportion that occupies, the present invention adopts the high-strength wearable material, and the strong guarantee oxygen lance is not damaged in transportation, use procedure.
4, oxygen lance is through depositing; epidermis all can produce rusty stain or greasy dirt is arranged, and common coating all needs and will just can smear behind rusty stain or the oil removal, and oxygen lance refractory paint plasticity-of the present invention, adhesivity are extremely strong; it goes without doing that any processing can be constructed to oxygen lance, simple and convenient.
Embodiment
Embodiment 1
Preparation fireproof oxygen lance coating, raw materials by weight comprises:
Mullite 45kg, silicon carbide 12kg, andaluzite 20kg, ρ-alumina powder 7kg, aluminate cement 4kg, water glass 10kg, carboxymethyl cellulose 2.5kg, metallic aluminium 0.3kg, water 5.6kg.
Preparation fireproof oxygen lance coating comprises following methods:
After mullite, silicon carbide, andaluzite, ρ-alumina powder, aluminate cement weighed up, put into stirrer and be dry mixed 5 minutes glass of falling back, carboxymethyl cellulose, metallic aluminium and water.Wait stir became sticky shape in 7-10 minute after, namely make fireproof oxygen lance coating, generally need to adjust the presetting period (being about 60 minutes).
Use above-mentioned fireproof oxygen lance coating, smear evenly (3-5mm) on the oxygen lance surface, at room temperature maintenance is 3 days after the moulding, and the packing bundling can use.
Embodiment 2
Preparation fireproof oxygen lance coating, raw materials by weight comprises:
Mullite 20kg, silicon carbide 8kg, andaluzite 10kg, ρ-alumina powder 5kg, aluminate cement 3kg, water glass 5kg, Walocel MT 20.000PV 1.1kg, explosion-proof fiber 0.1kg, water 3kg, Sodium Silicofluoride 1kg.
Preparation fireproof oxygen lance coating comprises following methods:
After mullite, silicon carbide, andaluzite, ρ-alumina powder, aluminate cement weighed up, put into stirrer and be dry mixed 5 minutes glass of falling back, carboxymethyl cellulose, explosion-proof fiber, Sodium Silicofluoride and water.Wait stir became sticky shape in 7-10 minute after, namely make fireproof oxygen lance coating.Generally need to adjust the presetting period (being about 60 minutes).
Embodiment 3
Preparation fireproof oxygen lance coating, raw materials by weight comprises:
Mullite 35kg, silicon carbide 10kg, andaluzite 15kg, ρ-alumina powder 7kg, aluminate cement 5kg, water glass 7kg, Guangxi clay 4kg, explosion-proof fiber 0.2kg, water 4.7kg.
Preparation fireproof oxygen lance coating method is with embodiment 1.
Embodiment 4
Preparation fireproof oxygen lance coating, raw materials by weight comprises:
Mullite 20kg, silicon carbide 8kg, andaluzite 10kg, ρ-alumina powder 5kg, aluminate cement 3kg, water glass 5kg, Guangxi clay 2.5kg, metallic aluminium 0.1kg, water 3kg, Sodium Silicofluoride 1.5kg.
Preparation fireproof oxygen lance coating comprises following methods:
After mullite, silicon carbide, andaluzite, ρ-alumina powder, aluminate cement weighed up, put into stirrer and be dry mixed 5 minutes glass of falling back, Guangxi clay, metallic aluminium, Sodium Silicofluoride and water.Wait stir became sticky shape in 7-10 minute after, namely make fireproof oxygen lance coating.Generally need to adjust the presetting period (being about 60 minutes).

Claims (5)

1. a fireproof oxygen lance coating is characterized in that, described fireproof oxygen lance coating raw material comprises by weight percentage:
Mullite 20%-50%, silicon carbide 8%-15%, andaluzite 10%-20%, ρ-alumina powder 5%-10%, aluminate cement 2%-6%, water glass 5%-10%, additive 2.1%-6.5%.
2. fireproof oxygen lance coating according to claim 1 is characterized in that, described additive comprises the combination of the detonation suppressor of the softening agent of 2%-6% and 0.1%-0.5%.
3. fireproof oxygen lance coating according to claim 2 is characterized in that, described softening agent is Walocel MT 20.000PV or clay, and described detonation suppressor is explosion-proof fiber or metallic aluminium.
4. fireproof oxygen lance coating according to claim 1 is characterized in that, also comprises Sodium Silicofluoride 0.5-3%.
5. method for preparing the described fireproof oxygen lance coating of claim 1 may further comprise the steps:
1) mullite, silicon carbide, andaluzite, alumina powder and aluminate cement are put into stirrer and be dry mixed the glass of falling back, additive and water;
2) with step 1) gained mixture through stirring, obtain fireproof oxygen lance coating.
CN201310322531.8A 2013-07-29 2013-07-29 Fireproof oxygen blowing tube coating Active CN103360094B (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103739300A (en) * 2013-12-16 2014-04-23 陈小杰 Composite oxygen-blowing pipe coating
CN103755362A (en) * 2013-12-24 2014-04-30 河南瑞泰耐火材料科技有限公司 Coating for oxygen lance of nonferrous smelting furnace
CN104086188A (en) * 2014-06-26 2014-10-08 浙江锦诚耐火材料有限公司 Silicon carbide, mullite and andalusite spray coating for hot-blast stove dome
CN104311079A (en) * 2014-10-15 2015-01-28 马鞍山市申马机械制造有限公司 High-temperature resistant anti-sticking steel nano ceramic powder coating
CN104529373A (en) * 2014-12-15 2015-04-22 河南勃达微波设备有限责任公司 High-temperature-resisting anti-corrosion crucible

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009091204A (en) * 2007-10-10 2009-04-30 Jfe Refractories Corp Casting refractory for molten metal treatment
CN102503491A (en) * 2011-11-10 2012-06-20 武汉钢铁(集团)公司 Castable for ladle deslagging plate, and preparation method and applicable of castable

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009091204A (en) * 2007-10-10 2009-04-30 Jfe Refractories Corp Casting refractory for molten metal treatment
CN102503491A (en) * 2011-11-10 2012-06-20 武汉钢铁(集团)公司 Castable for ladle deslagging plate, and preparation method and applicable of castable

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103739300A (en) * 2013-12-16 2014-04-23 陈小杰 Composite oxygen-blowing pipe coating
CN103739300B (en) * 2013-12-16 2015-03-18 陈小杰 Composite oxygen-blowing pipe coating
CN103755362A (en) * 2013-12-24 2014-04-30 河南瑞泰耐火材料科技有限公司 Coating for oxygen lance of nonferrous smelting furnace
CN104086188A (en) * 2014-06-26 2014-10-08 浙江锦诚耐火材料有限公司 Silicon carbide, mullite and andalusite spray coating for hot-blast stove dome
CN104086188B (en) * 2014-06-26 2015-12-30 浙江锦诚耐火材料有限公司 The not red spray material of a kind of hotblast stove dome silicon
CN104311079A (en) * 2014-10-15 2015-01-28 马鞍山市申马机械制造有限公司 High-temperature resistant anti-sticking steel nano ceramic powder coating
CN104311079B (en) * 2014-10-15 2016-01-06 马鞍山市申马机械制造有限公司 A kind of high temperature resistant adhesion resistant steel nano ceramic powder coating
CN104529373A (en) * 2014-12-15 2015-04-22 河南勃达微波设备有限责任公司 High-temperature-resisting anti-corrosion crucible

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Effective date of registration: 20200609

Address after: Li Xin Zhen Nan Zhu Jia Zhuang Cun, Gangcheng District, Laiwu City, Jinan City, Shandong Province

Patentee after: LAIWU STEEL AND IRON GROUP XINXING LIQUID GAS Co.,Ltd.

Address before: 271104 Shandong province Laiwu City Shuangquan Road steel city Taidong company

Patentee before: LAIGANG GROUP TAIDONG INDUSTRIES Co.,Ltd.

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